CN215343002U - Antenna array, system and millimeter wave radar - Google Patents
Antenna array, system and millimeter wave radar Download PDFInfo
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- CN215343002U CN215343002U CN202121701806.5U CN202121701806U CN215343002U CN 215343002 U CN215343002 U CN 215343002U CN 202121701806 U CN202121701806 U CN 202121701806U CN 215343002 U CN215343002 U CN 215343002U
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Abstract
The embodiment of the utility model relates to the technical field of antennas, and discloses an antenna array, a system and a millimeter wave radar. The antenna array comprises a radiation patch layer, wherein the radiation patch layer is used for radiating high-frequency radar signals to a free space and comprises a plurality of antenna subunits and power dividers connected with the antenna subunits; the power divider comprises at least one amplitude adjusting section and an interval adjusting section connected with the amplitude adjusting section, the amplitude adjusting section is used for adjusting the amplitude of the high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunit. Through the mode, the scanning range of the antenna array is expanded.
Description
Technical Field
The embodiment of the utility model relates to the technical field of antennas, in particular to an antenna array, a system and a millimeter wave radar.
Background
With the continuous development of intelligent driving technology, vehicle-mounted millimeter wave radars are widely applied. The vehicle-mounted millimeter wave radar is a detection radar working in a millimeter wave band, and a microstrip antenna array is mostly adopted.
In the related art, a microstrip antenna array generally includes a plurality of antenna sub-elements, each of which is fed in phase. To achieve in-phase feeding of the individual antenna sub-elements, the array pitch between adjacent antenna sub-elements is one waveguide wavelength. However, the inventors found in the course of implementing embodiments of the present invention that: in the prior art, the side lobe in the radiation pattern of the microstrip antenna array is higher, so that an interference source in the side lobe direction causes interference to the microstrip antenna array, and the scanning range of the microstrip antenna array is smaller.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing problems, embodiments of the present invention provide an antenna array, a system and a millimeter wave radar, which are used to solve the problem in the prior art that the scanning range of the antenna array is small.
According to an aspect of the embodiments of the present invention, there is provided an antenna array, including a radiation patch layer, where the radiation patch layer is configured to radiate a high-frequency radar signal to a free space, and the radiation patch layer includes a plurality of antenna subunits and a power divider connected to the antenna subunits;
the power divider comprises at least one amplitude adjusting section and an interval adjusting section connected with the amplitude adjusting section, the amplitude adjusting section is used for adjusting the amplitude of the high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunit.
In an alternative mode, the distance adjusting section has a circular arc structure.
In an alternative mode, the length of the amplitude adjustment section is one quarter of the waveguide wavelength, and the length of the distance adjustment section is three quarters of the waveguide wavelength.
In an optional manner, the power divider is connected to the antenna subunit through a radiation efficiency adjusting section, and different impedances of the radiation efficiency adjusting section correspond to different radiation efficiencies of the antenna subunit.
In an optional manner, the power divider is connected to the radiation efficiency adjusting section through a phase adjusting section, and the phase adjusting section is configured to adjust a phase of the high-frequency radar signal.
In an optional mode, the antenna array further comprises a medium substrate layer and a ground layer;
the radiation patch layer is arranged on the upper surface of the medium substrate layer, and the grounding layer is arranged on the lower surface of the medium substrate layer.
In an optional manner, the power divider further includes a T-shaped junction, and the T-shaped junction is configured to transmit the high-frequency radar signal to each antenna subunit; the antenna subunits are symmetrically distributed on the left side and the right side of the T-shaped junction.
In an optional manner, the number of the antenna subunits is 2N, where N is a positive integer not less than 2.
According to another aspect of the embodiments of the present invention, there is provided an antenna system including the antenna array described above.
According to still another aspect of an embodiment of the present invention, there is provided a millimeter wave radar including the antenna system described above.
The antenna array comprises a radiation patch layer, wherein the radiation patch layer can radiate a high-frequency radar signal to a free space; the radiation patch layer comprises a plurality of antenna subunits, the antenna subunits are connected with the power divider, the power divider comprises an amplitude adjusting section, the amplitude adjusting section is connected with an interval adjusting section, the amplitude adjusting section can adjust the amplitude of a high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunits. By the structure of the distance adjusting section, the antenna array of the embodiment of the utility model can reduce the array distance between the antenna subunits, avoid the interference caused by higher side lobes in a radiation pattern and enlarge the scanning range of the antenna array.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an antenna array provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a radiation patch layer provided by an embodiment of the present invention;
fig. 3 illustrates a structural schematic diagram of a radiation patch layer according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be embodied in various forms and should not be limited to the embodiments set forth herein.
Fig. 1 shows a schematic structural diagram of an antenna array according to an embodiment of the present invention. As shown in fig. 1, the antenna array includes a radiation patch layer 1, and the radiation patch layer 1 is used for radiating a high-frequency radar signal to a free space.
Fig. 2 shows a schematic structural diagram of the radiation patch layer 1 according to an embodiment of the present invention. As shown in fig. 2, the radiation patch layer 1 includes a plurality of antenna subunits 14 and a power divider 11 connected to the antenna subunits 14, where the power divider 11 includes a feeder line. The feed line includes at least one amplitude adjustment section 113 and a distance adjustment section 112 connected to the amplitude adjustment section, the amplitude adjustment section 113 is used to adjust the amplitude of the high-frequency radar signal, and the distance adjustment section 112 is recessed or protruded in a direction parallel to the extending direction of the antenna subunit 14.
The radiation pattern of the antenna array can reflect the performance of the antenna array, so that the amplitude and the phase of a high-frequency radar signal radiated by the antenna array need to be adjusted when the antenna array is designed, so that the designed antenna array can meet the actual requirement. In order to allow the antenna sub-elements 14 to be fed in phase, the length of the feed line between adjacent antenna sub-elements 14 in the power divider 11 is typically one waveguide wavelength. However, in the existing design, the feeder is long, so that the array spacing between the antenna sub-units 14 is large, and the side lobe in the radiation pattern of the antenna array is high, which causes the interference source in the side lobe direction to interfere with the antenna array. In the embodiment of the present invention, the distance adjusting section 112 is recessed or protruded in a direction parallel to the extending direction of the antenna sub-units 14, so that the array distance between the antenna sub-units 14 is reduced and interference of an interference source in the side lobe direction to the antenna array is avoided under the condition that the length of the feeder line between adjacent antenna sub-units 14 is kept unchanged.
It can be seen that in the antenna array of the embodiment of the present invention, the radiation patch layer may radiate the high-frequency radar signal to the free space; the radiation patch layer comprises a plurality of antenna subunits, the antenna subunits are connected with the power divider, the power divider comprises an amplitude adjusting section, the amplitude adjusting section is connected with an interval adjusting section, the amplitude adjusting section can adjust the amplitude of a high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunits. By the structure of the distance adjusting section, the antenna array of the embodiment of the utility model can reduce the array distance between the antenna subunits, avoid the interference caused by higher side lobes in a radiation pattern and enlarge the scanning range of the antenna array.
In an alternative manner, the distance adjustment section 112 can be designed as a curved line. Further, the interval adjustment section 112 may have a circular arc structure. In antenna array design, the curvature of the spacing adjustment segment 112 may be controlled to increase or decrease the array spacing between adjacent antenna subunits 14.
Wherein, the length of the amplitude adjusting section 113 may be one quarter of the waveguide wavelength, and the length of the interval adjusting section 112 may be three quarters of the waveguide wavelength. By setting the amplitude adjustment section 113 to a quarter of the waveguide wavelength and the distance adjustment section 112 to three quarters of the waveguide wavelength, the power divider 11 can be made to output a plurality of sets of high-frequency radar signals of the same phase. Further, the power divider 11 is connected to the antenna subunit 14 through the radiation efficiency adjusting section 13, and different impedances of the radiation efficiency adjusting section 13 correspond to different radiation efficiencies of the antenna subunit 14. When the antenna array design is performed, the impedance of the radiation efficiency adjusting section 13 may be controlled to increase or decrease the radiation efficiency of the antenna subunit 14. In the embodiment of the present invention, the power divider 11 is further connected to the radiation efficiency adjusting section 13 through the phase adjusting section 12, and the phase adjusting section 12 is used for adjusting the phase of the high-frequency radar signal. The phase adjustment section 12 may have a meander line structure, a curved line structure, or a meander line structure. When the antenna array is designed, the antenna sub-units 14 can be made to radiate high-frequency radar signals with different phases by controlling the different lengths of the phase adjusting sections 12.
The antenna array further comprises a medium substrate layer 2 and a ground layer 3, the radiation patch layer 1 is arranged on the upper surface of the medium substrate layer 2, and the ground layer 3 is arranged on the lower surface of the medium substrate layer 2. The power divider 11 further includes a T-shaped junction 111, the T-shaped junction 111 is used for transmitting the high-frequency radar signal to each antenna subunit 14, and the plurality of antenna subunits 14 are symmetrically distributed on the left side and the right side of the T-shaped junction.
As shown in fig. 2, the radiation patch layer 1 includes 6 antenna subunits 14, and there are 3 antenna subunits 14 on the left and right sides of the T-junction 11. The left side of the T-shaped junction 11 is directly connected with an antenna sub-unit 14, and the other 2 antenna sub-units 14 are sequentially connected through a feeder line. The right side of the T-shaped junction 11 is directly connected with an antenna subunit 14, and the other 2 antenna subunits 14 are sequentially connected through a feeder line. The high frequency radar signal is transmitted to each antenna subunit 14 via the T-junction 11. The high-frequency radar signal is divided into a left path of signal and a right path of signal after passing through the T-shaped junction 11, the left path of signal is fed into the left 3 antenna subunits through the amplitude adjusting section 113 and the distance adjusting section 112 which are connected in sequence, and the right path of signal is fed into the right 3 antenna subunits through the amplitude adjusting section 113 and the distance adjusting section 112 which are connected in sequence.
Fig. 3 illustrates a structural schematic diagram of a radiation patch layer according to another embodiment of the present invention. As shown in fig. 3, the radiating patch layer includes 4 antenna subunits 14. Further, when the antenna array is designed, the number of the antenna sub-units 14 in the antenna array may be designed to be 2N, where N is a positive integer not less than 2, that is, the number of the antenna sub-units 14 may be 4, 6, 8, and the like.
When the antenna array is designed, the number of the antenna subunits 14 included in the antenna array may be determined first, and then the design parameters of each antenna subunit 14 may be determined. Design parameters of antenna sub-unit 14 include the amplitude and phase of the high frequency radar signal radiated by antenna sub-unit 14, the radiation efficiency of antenna sub-unit 14, and the array spacing between adjacent antenna sub-units 14. Further, initial design parameters may be set for the antenna array, and the performance of the antenna array under the corresponding design parameters is evaluated by simulation software, so as to determine the optimal design parameters of each antenna subunit 14.
One antenna sub-unit 14 may be selected from the antenna sub-units 14 as a reference antenna sub-unit. After the amplitude relationship among the antenna sub-units 14 is determined, the amplitude of the high-frequency radar signal radiated by the antenna sub-unit 14 other than the reference antenna sub-unit is adjusted by taking the amplitude of the reference antenna sub-unit as a reference, that is, the characteristic impedance of the amplitude adjusting section 113 is increased to increase the amplitude of the high-frequency radar signal radiated by the corresponding antenna sub-unit 14, and the characteristic impedance of the amplitude adjusting section 113 is decreased to decrease the amplitude of the high-frequency radar signal radiated by the corresponding antenna sub-unit 14. After the phase relationship between the antenna sub-units 14 is determined, the phase of the high-frequency radar signal radiated by the antenna sub-unit 14 other than the reference antenna sub-unit is adjusted based on the phase of the reference antenna sub-unit, that is, the length of the phase adjustment section 12 is increased to increase the phase of the high-frequency radar signal radiated by the corresponding antenna sub-unit 14, and the length of the phase adjustment section 12 is decreased to decrease the phase of the high-frequency radar signal radiated by the corresponding antenna sub-unit 14. After the radiation efficiency of each antenna subunit 14 is determined, the radiation efficiency of the antenna subunits 14 other than the reference antenna subunit is adjusted based on the radiation efficiency of the reference antenna subunit, that is, the impedance of the radiation efficiency adjusting section 13 is increased to reduce the radiation efficiency of the corresponding antenna subunit 14, and the impedance of the radiation efficiency adjusting section 13 is reduced to increase the radiation efficiency of the corresponding antenna subunit 14.
After determining the optimal array pitch between the adjacent antenna subunits 14, if the optimal array pitch is greater than the initial array pitch between the adjacent antenna subunits 14, the curvature of the pitch adjustment segment 112 may be decreased to adjust the array pitch between the adjacent antenna subunits 14 to the optimal array pitch; if the optimal array pitch is less than the initial array pitch between adjacent antenna subunits 14, the curvature of the pitch adjustment segment 112 may be increased to adjust the array pitch between adjacent antenna subunits 14 to the optimal array pitch.
In addition, an embodiment of the present invention further provides an antenna system, which includes the antenna array. In the antenna array of the antenna system in the embodiment of the utility model, the radiation patch layer can radiate the high-frequency radar signal to the free space; the radiation patch layer comprises a plurality of antenna subunits, the antenna subunits are connected with the power divider, the power divider comprises an amplitude adjusting section, the amplitude adjusting section is connected with an interval adjusting section, the amplitude adjusting section can adjust the amplitude of a high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunits. Through the structure of the distance adjusting section, the antenna array provided by the embodiment of the utility model can reduce the array distance between the antenna subunits, avoid interference caused by higher side lobes in a radiation pattern, and enlarge the scanning range of an antenna system.
In addition, the embodiment of the utility model also provides a millimeter wave radar which comprises the antenna system. In the antenna system of the millimeter wave radar of the embodiment of the utility model, the radiation patch layer can radiate high-frequency radar signals to a free space; the radiation patch layer comprises a plurality of antenna subunits, the antenna subunits are connected with the power divider, the power divider comprises an amplitude adjusting section, the amplitude adjusting section is connected with an interval adjusting section, the amplitude adjusting section can adjust the amplitude of a high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunits. Through the structure of the distance adjusting section, the antenna array provided by the embodiment of the utility model can reduce the array distance between the antenna subunits, avoid interference caused by higher side lobes in a radiation pattern, and enlarge the scanning range of the millimeter wave radar.
It is to be noted that technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which embodiments of the present invention belong, unless otherwise specified.
In the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientations and positional relationships indicated in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Furthermore, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely below the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. An antenna array is characterized in that the antenna array comprises a radiation patch layer, the radiation patch layer is used for radiating high-frequency radar signals to a free space, and the radiation patch layer comprises a plurality of antenna subunits and power dividers connected with the antenna subunits;
the power divider comprises at least one amplitude adjusting section and an interval adjusting section connected with the amplitude adjusting section, the amplitude adjusting section is used for adjusting the amplitude of the high-frequency radar signal, and the interval adjusting section is sunken or protruded towards the direction parallel to the extending direction of the antenna subunit.
2. An antenna array according to claim 1, wherein the spacing adjustment segments are circular arc structures.
3. An antenna array according to claim 1 or 2, wherein the length of the amplitude adjustment segment is one quarter of a waveguide wavelength and the length of the spacing adjustment segment is three quarters of a waveguide wavelength.
4. An antenna array according to claim 1, wherein the power divider is connected to the antenna sub-elements through a radiation efficiency adjusting section, and different impedances of the radiation efficiency adjusting section correspond to different radiation efficiencies of the antenna sub-elements.
5. An antenna array according to claim 4, wherein the power divider is connected to the radiation efficiency adjusting section through a phase adjusting section for adjusting the phase of the high frequency radar signal.
6. An antenna array according to claim 1, further comprising a dielectric substrate layer and a ground layer;
the radiation patch layer is arranged on the upper surface of the medium substrate layer, and the grounding layer is arranged on the lower surface of the medium substrate layer.
7. An antenna array according to claim 1, wherein the power divider further comprises a T-junction for transmitting the high frequency radar signal to each antenna sub-unit; the antenna subunits are symmetrically distributed on the left side and the right side of the T-shaped junction.
8. An antenna array according to claim 1, wherein the number of antenna sub-elements is 2N, where N is a positive integer no less than 2.
9. An antenna system, characterized in that the antenna system comprises an antenna array according to any of claims 1 to 8.
10. A millimeter-wave radar characterized in that it comprises an antenna system according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121701806.5U CN215343002U (en) | 2021-07-23 | 2021-07-23 | Antenna array, system and millimeter wave radar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121701806.5U CN215343002U (en) | 2021-07-23 | 2021-07-23 | Antenna array, system and millimeter wave radar |
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| CN215343002U true CN215343002U (en) | 2021-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843770A (en) * | 2022-04-19 | 2022-08-02 | 福思(杭州)智能科技有限公司 | Microstrip antenna and millimeter wave radar |
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2021
- 2021-07-23 CN CN202121701806.5U patent/CN215343002U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843770A (en) * | 2022-04-19 | 2022-08-02 | 福思(杭州)智能科技有限公司 | Microstrip antenna and millimeter wave radar |
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Address after: 518000 401, Building B1, Nanshan Zhiyuan, No. 1001, Xueyuan Avenue, Changyuan Community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Saifang Technology Co.,Ltd. Address before: 518000 room 701, building B1, Nanshan wisdom garden, 1001 Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Daotong Intelligent Automobile Co.,Ltd. |
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